San Francisco — Six days after it was closed because of a failed repair job, snarling traffic throughout the Bay Area and raising fresh safety concerns, the San Francisco-Oakland Bay Bridge reopened around 9 a.m. Monday.

The bridge, one of the busiest in the world, was shuttered when a 5,000 pound crossbar and two steel rods collapsed onto evening rush-hour traffic last Tuesday, damaging three cars and injuring one motorist.

Transportation officials blamed traffic vibration and high winds for undoing a Labor Day repair job to a cracked structural beam called an eyebar.

The new system passed all tests with "flying colors," Caltrans said. At a Monday morning press conference, spokesman Bart Ney said that officials will continue monitoring the repair, looking for any stresses in that part of the Bay Bridge, which carries about 280,000 motorists daily.

Officials proceeded cautiously in undertaking repairs, he added. The repair was reportedly delayed when tests revealed that the newly-installed tie rods "were continuing to scrape together," according to the San Francisco Chronicle.